I don't think that there is such site that offers it .
You should be the one that calculates it on your own.
Or if I am not mistaken you could use bot's to do it for you.
Your truly correct mate, trading job is very serious work need to give more quality time to monitor the moving of the cois or tiken traded by the trader itself to avoid loses double effort.
No there isn't to the best of my knowledge. How difficult could it be to calculate your break even price anyways? Sure, it's a bit of math, and sure you have to take into account all the various fees (takers, makers, whatever) but it shouldn't be too complicated. If you are serious about trading you have to learn to do the math every time you trade.
Learning math is a very basic important in trading to calculates lose or break even strategy incase they trap.